You mean the feature pack thing?
I think you have to actually run through the Add Features to Windows 8.1 option in wuapp.exe to convert your system properly while online.

Sorry if I'm misunderstanding you. You mentioned an ISO file and a hotfix, I'm just assuming you mean the media features pack.

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If ProfessionalN edition with the WMP pack (KB2835517) is used, then sorry, because ProfessionalN can't be upgraded to ProfessionalWMC, as being the highest edition on the N path.

If you are already on ProfessionalWMC, you can't use Add features option, as this UI can't be used, because a) it is just the renamed Windows Anytime Upgrade function; and b) there is no edition to upgrade to, therefore the Microsoft-Windows-Anytime-Upgrade-Package is disabled. Wuapp.exe is a launcher for Windows Update.

If ProfessionalWMCEdition is indeed what is used, check if WMC is enabled in optionalfeatures.exe.

If ProfessionalN edition with the WMP pack (KB2835517) is used, then sorry, because ProfessionalN can't be upgraded to ProfessionalWMC, as being the highest edition on the N path.

If you are already on ProfessionalWMC, you can't use Add features option, as this UI can't be used, because a) it is just the renamed Windows Anytime Upgrade function; and b) there is no edition to upgrade to, therefore the Microsoft-Windows-Anytime-Upgrade-Package is disabled. Wuapp.exe is a launcher for Windows Update.

If ProfessionalWMCEdition is indeed what is used, check if WMC is enabled in optionalfeatures.exe.

Since it's a new install (at least going from what you wrote),the easiest albeit slightly more time intensive way to get WMC in 8.1 (aside from just buying Windows ) is to install a vanilla 8.0 Pro -> Activate it with the Microsoft Toolkit -> Use the Add Features to input your WMC key -> Run windows update (after WMC is properly set up) and finally use the Store update to get 8.1 up and running. I know it's not the most direct route,but it'll probably take you way less time to go that route than to debug a sketchy homebrew WMC iso (bonus points for it permanently activating your Windows install*)

Btw, for using that Athlon (I got great mileage outta my trusty 3500+ .. In fact that lil' bugger is still happily chugging along as my Dad's workshop computer to this day)

Since it's a new install (at least going from what you wrote),the easiest albeit slightly more time intensive way to get WMC in 8.1 (aside from just buying Windows ) is to install a vanilla 8.0 Pro -> Activate it with the Microsoft Toolkit -> Use the Add Features to input your WMC key -> Run windows update (after WMC is properly set up) and finally use the Store update to get 8.1 up and running. I know it's not the most direct route,but it'll probably take you way less time to go that route than to debug a sketchy homebrew WMC iso (bonus points for it permanently activating your Windows install*)

Btw, for using that Athlon (I got great mileage outta my trusty 3500+ .. In fact that lil' bugger is still happily chugging along as my Dad's workshop computer to this day)

*provided Microsoft hasn't patched that oversight.

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The more legit looking way was already posted by kelorgo. Instead of KMS activation better use the Default Retail Install Keys for Win 8 Pro and the WMC, then upgrade via store. Otherwise it might react picky and won't activate properly.

Are you really sure you used the correct ISO. The one you need is named simply 'Windows 8.x' and holds two indices Pro(1) and Core(2) and is for the Retail/OEM market. Then there is a 'Windows 8.x Pro_VL' ISO with only one index (Pro). The latter doesn't offer the Upgrade Option.

The more legit looking way was already posted by kelorgo. Instead of KMS activation better use the Default Retail Install Keys for Win 8 Pro and the WMC, then upgrade via store. Otherwise it might react picky and won't activate properly.

Are you really sure you used the correct ISO. The one you need is named simply 'Windows 8.x' and holds two indices Pro(1) and Core(2) and is for the Retail/OEM market. Then there is a 'Windows 8.x Pro_VL' ISO with only one index (Pro). The latter doesn't offer the Upgrade Option.

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Oh,right,I forgot those since it's been ages (or like 4-5 years) since I went legit and stopped paying real attention to installing stuff without a valid license Hell,the only reason I knew ^ is that when I read online that a free WMC code perma-activated 8 I thought it couldn't be true(plus had an hour to burn to see for myself).

Oh,right,I forgot those since it's been ages (or like 4-5 years) since I went legit and stopped paying real attention to installing stuff without a valid license Hell,the only reason I knew ^ is that when I read online that a free WMC code perma-activated 8 I thought it couldn't be true(plus had an hour to burn to see for myself).

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Still working with slightly raised hurdles . Still very comfort with the OS friendly gifted by MS .

The more legit looking way was already posted by kelorgo. Instead of KMS activation better use the Default Retail Install Keys for Win 8 Pro and the WMC, then upgrade via store. Otherwise it might react picky and won't activate properly.

Are you really sure you used the correct ISO. The one you need is named simply 'Windows 8.x' and holds two indices Pro(1) and Core(2) and is for the Retail/OEM market. Then there is a 'Windows 8.x Pro_VL' ISO with only one index (Pro). The latter doesn't offer the Upgrade Option.

Also, please don't ask if I will make a win8.1+UpdateWMC, MDL doesn't allow post links to modded ISO's(or the dat files), I made the zn-CH ISO's for PCBeta, but I'll pass for en-US.

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Created mine with an unused Pro Key from a friend . Did this in Audit Mode in a VM and do snapshot it after every update. So it's easy to keep it updated and only needs to capture it after every Update Tuesday .

Created mine with an unused Pro Key from a friend . Did this in Audit Mode in a VM and do snapshot it after every update. So it's easy to keep it updated and only needs to capture it after every Update Tuesday .

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Lucky chap.

Talked about making the 17031WMC ISO, there was a indication that there would still be further revised:

When I addpackages(the 4 MSU's) to the win8.1 install.wim, it failed to imagecleanup and resetbase, the resulting wim for X64 was 4.11GB, and the ISO was 4.8x GB, larger than the 4.7GB capacity of a DVD.

Naturally, the MSDN ISO would be the image compiled by MS that has a "normal size", but for users with a win8.1ISO and tried to slipstream the updates, they will end up with a extra large wim(and ISO), it would be quite "un-MS" to leave it un-attended.